That was it! Makes perfect sense now that someone else suggested it to me!
Thanks again!
Bob
Mike Horwitz wrote:
>
> Are you passing the id in the call from your jsp? If you are not, then
> Hibernate will think these are new entities and save rather than update
> them.
>
> Mike
>
> On 10/22/07, syg6 <[EMAIL PROTECTED]> wrote:
>>
>>
>> Yep. I left it out for brevity. Besides, I don't think Hibernate would be
>> able to do the inserts if I hadn't defined a PK, no?
>>
>> Anyway, here it is:
>>
>> @Column(name="idAAndBJoin")
>> @Id @GeneratedValue(strategy = GenerationType.AUTO)
>> public Long getId()
>>
>> Man, I got quite excited for a minute there. But alas, that's not the
>> problem ...
>>
>> Bob
>>
>>
>> Mike Horwitz wrote:
>> >
>> > Have you assigned a primary key field to your AAndBJoin object?
>> >
>> > Mike.
>> >
>> > On 10/22/07, syg6 <[EMAIL PROTECTED]> wrote:
>> >>
>> >>
>> >> Hello listers.
>> >>
>> >> I have posted on this before. I got no replies, either here or over at
>> >> hibernate.org. So I parked the issue and moved on but now I have to
>> deal
>> >> with it. Because of my limited Hibernate knowledge, I am not even
>> really
>> >> sure of what things to try anymore. Can someone shed some light on
>> this
>> >> problem for me?
>> >>
>> >> I have two Objects, ObjectA and ObjectB. They have a ManyToMany
>> >> relationship
>> >> with attributes, meaning they have a join table with IdObjectA and
>> >> IdObjectB
>> >> as foreign keys and some attributes. As recommended by the Hibernate
>> >> docs,
>> >> I
>> >> create a class, AAndBJoin we'll call it. Here's what it all looks
>> like:
>> >>
>> >> public class ObjectA
>> >> {
>> >> private Set<AAndBJoin> aAndBJoins;
>> >>
>> >> @OneToMany(mappedBy="ObjectA", fetch = FetchType.EAGER, cascade = {
>> >> CascadeType.ALL })
>> >> public Set<AAndBJoin> getAAndBJoins ()
>> >>
>> >> public class ObjectB
>> >> {
>> >> private Set<AAndBJoin> aAndBJoins;
>> >>
>> >> @OneToMany(mappedBy="ObjectB")
>> >> public Set<AAndBJoin> getAAndBJoins ()
>> >>
>> >> public class AAndBJoin
>> >> {
>> >> private ObjectA objectA;
>> >> private ObjectB objectB;
>> >>
>> >> @ManyToOne
>> >> @JoinColumn(name="idObjectA")
>> >> public ObjectA getObjectA()
>> >>
>> >> @ManyToOne
>> >> @JoinColumn(name="idObjectB")
>> >> public ObjectB getObjectB()
>> >>
>> >> The problem is that when I save an ObjectA, with its associated Set of
>> >> AAndBJoin Objects, ONLY inserts are done in the AAndBJoin table in the
>> >> database, any existing information is NOT being updated or deleted. So
>> if
>> >> I
>> >> start off with 2 AAndBJoin Objects and add 1, instead of having 3 I
>> now
>> >> have
>> >> 5 because 3 inserts are performed, one for each AAndBJoin Object sent
>> to
>> >> the
>> >> FormController from the .jsp, but the original 2 are left untouched.
>> >>
>> >> Do I have to play with the AAndBJoin Object, like add Cascade
>> information
>> >> or
>> >> something else? In the example there was none, and I have tried
>> putting
>> >> Cascade.ALL for the two getters, no dice. Or perhaps I have to do
>> >> something
>> >> manually, like call session.flush() or something, to get Hibernate to
>> >> (worst
>> >> case scenario) delete the info in the AAndBJoin table first before
>> >> inserting? I am not sure even how to do this since Spring is in the
>> mix.
>> >> I
>> >> have tried debugging Hibernate to see what's going on but since Spring
>> is
>> >> involved and uses Reflection and AopProxies and all kinds of stuff I
>> >> haven't
>> >> a clue about, I never actually see any Hibernate code executed ...
>> >>
>> >> I would really appreciate some help on this one!
>> >>
>> >> Bob
>> >> --
>> >> View this message in context:
>> >>
>> http://www.nabble.com/Many-to-many-collection-problem-tf4670322s2369.html#a13341640
>> >> Sent from the AppFuse - User mailing list archive at Nabble.com.
>> >>
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>> >
>> >
>>
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